CN116208192A - Method and system for anti-interference and anti-multipath under multi-rate in UAV and satellite communication - Google Patents

Abstract

The present application relates to a multi-rate anti-jamming and anti-multipath method and system in UAV and satellite communication. The method includes the following steps: obtaining the data rate of business data; The business data is loaded into the frequency hopping data block; the frequency hopping data block is processed according to the data rate of the business data and the preset business data processing rules to generate a modulated signal; the modulated signal is sent to the receiving end according to the frequency hopping code sequence to After receiving the modulated signal according to the frequency hopping code sequence, the receiving end processes the modulated signal to complete the transmission of service data. Wherein, the processing of the frequency hopping data block includes adding UW word and spreading according to the spreading code sequence, and the processing of the frequency hopping data block is determined according to the data rate of the service data. The present application enables service data to obtain better anti-multipath and anti-interference capabilities under different data rate conditions.

Description

Method and system for anti-interference and anti-multipath under multi-rate in UAV and satellite communication

technical field

The present application relates to the field of business data transmission methods, in particular to an anti-jamming and anti-multipath method and system at multiple rates in UAV and satellite communications.

Background technique

The wireless channel is based on the free propagation of electromagnetic waves in space to realize the transmission of business signals. It has the characteristics of openness. When the wireless channel environment through which business data is transmitted is complex, it is easy to cause interference. At the same time, in complex wireless channels, It is also very prone to multipath effects.

The multipath effect (multipath effect) means that after the electromagnetic wave propagates through different paths, each component field arrives at the receiving end at different times, and superimposes each other according to their respective phases to cause interference, distorting the original signal or generating errors; the multipath effect is fading Important reasons have a very serious impact on the transmission of business data.

Due to different actual business requirements, business data will have different transmission rates. The transmission rate of business data will have different impacts on multipath effects. For different data rates of business data, if the business data is processed in the same way Processing so that business data will not be affected by interference and multipath effects during transmission will cause all aspects of the performance of the signal transmission system to be unsatisfactory.

Contents of the invention

In order to enable business data to obtain better anti-multipath performance at different data rates during transmission, the present application provides an anti-interference and anti-multipath method and system at multiple rates in UAV and satellite communication.

In the first aspect, the multi-rate anti-jamming and anti-multipath method in UAV and satellite communication provided by the application adopts the following technical scheme:

An anti-jamming and anti-multipath method under multi-rate in unmanned aerial vehicle and satellite communication, described method comprises the following steps:

Obtain the data rate of business data;

generating a frequency hopping code sequence and filling the service data into a frequency hopping data block according to the frequency hopping code sequence;

Processing the frequency hopping data block according to the data rate of the service data and preset service data processing rules to generate a modulated signal;

Send the modulated signal to the receiving end according to the frequency hopping code sequence, so that the receiving end processes the modulated signal after receiving the modulated signal according to the frequency hopping code sequence, and completes the service transmission of data.

By adopting the above technical solution, the service data is transmitted by frequency hopping, and the transmission frequency of each frequency hopping data block is controlled by the frequency hopping sequence code. When there is a multipath propagation environment, due to the difference in multipath delay, the time for the signal to reach the receiving end is different. First, if the receiver hops the carrier frequency to another frequency immediately after receiving the first arriving signal, it can avoid the interference of the received signal due to multipath delay, and effectively improve the anti-multipath of the system capability; at the same time, different processing is performed on the business data according to the data rate of the business data, so that the system can obtain better anti-multipath and anti-jamming performance under different data rate conditions.

Preferably, processing the frequency hopping data block according to the data rate of the service data and preset service data processing rules to generate a modulation signal specifically includes the following steps:

generating a spreading code sequence according to the data rate of the service data and preset service data processing rules;

Spreading the frequency hopping data block by using the spreading code sequence;

Select a modulation method according to the data rate of the service data and the preset service data processing rules, and the modulation method includes QPSK or BPSK;

The frequency hopping data block is modulated according to the selected modulation mode to generate a modulated signal.

By adopting the above technical solution, different spreading code sequences are generated according to the data rate of the service data, and different degrees of spreading are performed on the service data with different data rates. The lower the data rate of the service data, the greater the degree of spreading , the stronger the anti-interference ability.

Preferably, after spreading the effective data frame in the frequency hopping data block according to the spreading code sequence, the following steps are further included:

Adding a UW word to the frequency hopping data block according to the data rate of the service data and preset service data processing rules, so that the receiving end performs single-carrier frequency domain equalization on the modulated signal according to the UW word deal with.

By adopting the above technical scheme, by adding UW words in the frequency hopping data block, the receiving end can complete the channel estimation and equalization processing according to the UW words after receiving the modulated signal; the larger the data length of the UW words, the better the estimation of the channel The more accurate, but at the same time the larger the frequency hopping data block is occupied, resulting in lower transmission efficiency. Therefore, the data length of the UW word is changed according to the data rate of the business data, and the channel estimation and equalization are completed on the premise of improving the transmission efficiency as much as possible. deal with.

Preferably, when the modulated signal is sent to the receiving end by frequency hopping, so that the receiving end processes the modulated signal after receiving the modulated signal, and completes the transmission of the service data, it specifically includes the following step:

receiving the modulated signal according to the frequency hopping code sequence;

removing the UW word contained in the modulated signal to generate a sequence to be equalized;

Performing single-carrier frequency-domain equalization processing on the sequence to be equalized to obtain reconstructed data symbols, each processed data block of the single-carrier frequency-domain equalization processing is a frequency hopping data block;

Despread and demodulate the data symbols to complete the transmission of the service data.

By adopting the above technical solution, the equalization processing of the modulated signal is completed at the receiving end, and the reconstructed data symbols after the equalization processing are despread and demodulated, restored to service data, and the signal transmission is completed; the single carrier equalization processing completes the The characteristic estimation of the channel is to calibrate and equalize the modulated signal according to the channel characteristic, and eliminate the interference effect of the channel on the modulated signal.

Preferably, performing single-carrier frequency-domain equalization on the sequence to be equalized specifically includes the following steps:

Perform N-point FFT on the sequence to be equalized to generate a frequency domain sequence Y(n);

Obtain channel characteristics according to the UW word;

Obtain an equalization coefficient W _K according to the channel characteristics;

Perform equalization processing on the frequency domain sequence Y(n) according to the equalization coefficient W _K to obtain an equalized sequence X(n), wherein: X(n)=W _K Y(n);

Performing an N-point IFFT on the equalized sequence X(n), transforming the equalized sequence X(n) into a time domain to obtain a time domain sequence;

Judging the time-domain sequence to obtain the reconstructed data symbols, and completing single-carrier frequency-domain equalization processing.

By adopting the above technical solution, the sequence to be equalized is subjected to single-carrier frequency domain equalization processing, the influence of the channel on service data transmission is determined according to the UW word, the equalization coefficient is generated according to the channel characteristics, and the influence of the channel on the service data is eliminated at the receiving end through the equalization coefficient. Complete the balance of business data.

Preferably, before performing single-carrier frequency-domain equalization on the sequence to be equalized, the following steps are further included:

Judging whether the data length N _b of the sequence to be equalized is less than the FFT length N;

If so, N _c zero values are added at the end of the sequence to be equalized, wherein:

N _c =NN _b ;

performing the single-carrier frequency-domain equalization processing on the sequence to be equalized after N _c zero value supplements are completed.

By adopting the above technical scheme, for the sequence to be equalized whose data length is less than N, several zero values are added at the end of the sequence to be equalized, so that the data length of the sequence to be equalized becomes N, and the zero-filling operation makes the data lengths of different The sequence to be equalized can reuse the same FFT or IFFT program, saving resources and reducing program complexity.

Preferably, when judging the time-domain sequence x _k (n), the judging is delayed by several data points.

By adopting the above technical solution, it is avoided that other multipath information before the main path is introduced when making a decision.

In the second aspect, the multi-rate anti-jamming and anti-multipath system in UAV and satellite communication provided by this application adopts the following technical scheme:

A multi-rate anti-jamming and anti-multipath system in unmanned aerial vehicle and satellite communication, the system includes the following modules:

A data rate acquisition module, configured to acquire the data rate of the service data;

A frequency hopping data block generating module, configured to generate a frequency hopping code sequence and fill the service data into the frequency hopping data block according to the frequency hopping code sequence;

A modulated signal generating module, configured to process the frequency-hopping data block according to the data rate of the service data and preset service data processing rules, to generate a modulated signal;

Modulated signal sending module, configured to send the modulated signal to the receiving end according to the frequency hopping code sequence, so that the receiving end can send the modulated signal to the modulated signal after receiving the modulated signal according to the frequency hopping code sequence Processing is performed to complete the transmission of the service data.

In the third aspect, the present application provides a computer device, which adopts the following technical solution: it includes a memory and a processor, and the memory stores data that can be loaded by the processor and execute any of the above-mentioned multi-rate data in communication between UAVs and satellites. A computer program for the anti-jamming and anti-multipath method.

In the fourth aspect, the present application provides a computer-readable storage medium, which adopts the following technical solution: stores a program that can be loaded by a processor and execute any of the above-mentioned multi-rate anti-jamming and anti-multipath methods in communication between UAVs and satellites .

In summary, the present application includes at least one of the following beneficial technical effects:

1. Process the service signal by means of frequency hopping retransmission, intra-hop spread spectrum and adding training sequence, so that the service signal can have the ability to resist interference and multipath effect during transmission, and ensure the transmission quality of service data;

2. Select different processing methods for business data according to different data rates of business data. The adaptive processing mode is conducive to improving the transmission efficiency of business data. Different spreading degrees and UW word lengths are also based on different data rates of business data The adaptive adjustment made is conducive to improving the sensitivity and signal-to-noise ratio of the signal;

3. When performing FFT and IFFT at the receiving end, zero-padding is adopted to enable the multiplexing of FFT or IFFT with the same number of points for service data of different data lengths, which is beneficial to save resources and reduce program complexity.

Description of drawings

Fig. 1 is a flow chart of a multi-rate anti-jamming and anti-multipath method in communication between a UAV and a satellite provided by an embodiment of the present application.

FIG. 2 is a schematic diagram of a frame structure of a frequency hopping data block in a multi-rate anti-jamming and anti-multipath method provided in an embodiment of the present application.

Fig. 3 is a schematic diagram of the business data processing rules in the multi-rate anti-jamming and anti-multipath method provided by the embodiment of the present application.

Fig. 4 is a system block diagram of a multi-rate anti-jamming and anti-multipath system in UAV and satellite communication provided by an embodiment of the present application.

Fig. 5 is a schematic structural diagram of an anti-jamming and anti-multipath device in multi-rate communication provided by an embodiment of the present application.

Description of reference signs: 401, data rate acquisition module; 402, frequency hopping data block generation module; 403, modulation signal generation module; 404, modulation signal transmission module; 500, electronic equipment; 501, processor; 502, communication bus; 503. User interface; 504. Network interface; 505. Storage.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them.

In the description of the embodiments of the present application, words such as "exemplary", "for example" or "for example" are used as examples, illustrations or illustrations. Any embodiment or design solution described as "exemplary", "for example" or "for example" in the embodiments of the present application shall not be interpreted as being more preferred or more advantageous than other embodiments or design solutions. Rather, the use of words such as "exemplary", "for example" or "for example" is intended to present the relevant concepts in a concrete manner.

In the description of the embodiments of the present application, the term "and/or" is only an association relationship describing associated objects, indicating that there may be three relationships, for example, A and/or B may indicate: A exists alone, A exists alone There is B, and there are three cases of A and B at the same time. In addition, unless otherwise specified, the term "plurality" means two or more. For example, multiple systems refer to two or more systems, and multiple screen terminals refer to two or more screen terminals. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. The terms "including", "comprising", "having" and variations thereof mean "including but not limited to", unless specifically stated otherwise.

The embodiment of the present application discloses a multi-rate anti-jamming and anti-multipath method in UAV and satellite communication.

Please refer to Figure 1. At the sending end, the multi-rate anti-interference and anti-multipath method in UAV and satellite communication includes the following steps:

S101: Obtain the data rate of service data;

Specifically, the data rate of service data is obtained according to actual service requirements. In an embodiment of the present application, the data of service data can be set by personnel according to actual requirements.

S102: Generate a frequency hopping code sequence and load service data into the frequency hopping data block according to the frequency hopping code sequence;

Specifically, frequency hopping (Frequency-Hopping; FH) is one of the most commonly used spread spectrum methods, and its working principle refers to a communication method in which the carrier frequency of the transmission signal of the transmitting and receiving parties changes discretely according to a predetermined rule, that is to say, in the communication The used carrier frequency is randomly hopped under the control of the pseudo-random change code.

When performing frequency hopping communication, the sending end and the receiving end can perform frequency carrier hopping according to certain rules. The frequency carrier hopping rule is controlled by the frequency hopping code sequence. The frequency hopping code sequence can be based on m sequence, M sequence, The pseudo-random sequence designed by RS code, etc., and the frequency-hopping code sequence is generated by the frequency-hopping code sequence generator.

In an embodiment of the present application, service data will be sent in each hopping group, each hopping group contains multiple hops, each hop is a specific frequency hopping data block, and the effective data frame in each frequency hopping data block The same, that is, the frequency hopping data blocks sent by frequency hopping in the same hopping group transmit the same service data, realizing frequency hopping retransmission, and the sending frequency of each hop is controlled by the frequency hopping code sequence.

S103: Process the frequency-hopping data block according to the data rate of the service data and the preset service data processing rule, and generate a modulated signal;

Specifically, after the data rate of the service data is obtained, a processing mode for the frequency hopping data block is determined according to the data rate of the service data and a preset service data processing rule.

The business data processing rules stipulate the processing methods for frequency hopping data blocks corresponding to different data rates. In an embodiment of the present application, in the business data processing rules, the data rate intervals of business data are divided into three categories, including low-speed Interval, medium-speed interval and high-speed interval, different data rate intervals correspond to different frequency hopping data block processing methods, when the data rate of the actual business data falls in any of the three types of intervals, it can be determined which The frequency hopping data block is processed by means of a method, wherein the data rate range of the low-speed interval is specifically 276Kbps-678Kbps, the data rate range of the medium-speed interval is specifically 678Kbps-1300Kbps, and the data rate range of the high-speed interval is specifically 1300Kbps-2228Kbps.

After determining the data mode of the frequency hopping data block, first spread the effective data frame in the frequency hopping data block to generate a spreading code sequence, which is generated by a spreading code sequence generator, according to the spreading code The sequence performs direct sequence spread spectrum on the frequency hopping data block, and expands the bandwidth of the frequency hopping data block to N times the original bandwidth, so that the frequency hopping data block has certain anti-interference and anti-multipath capabilities during data transmission. The frequency spreading degree of the effective data frame is determined according to the data rate of the business data. When the data rate of the business data is in the low-speed range, the frequency-hopping data block is spread by 24 times; when the data rate of the business data is in the medium-speed range, Perform 32-fold frequency spreading on the frequency hopping data block; when the data rate of the service data is in the high-speed range, do not perform frequency spreading on the frequency hopping data block.

After completing the spread spectrum of the frequency hopping data block according to the data rate of the service data and the preset service data processing rules, add the UW word at the head and end of the effective data frame of the frequency hopping data block, the UW word is the training sequence, It is used to realize frequency hopping synchronization calibration, frequency offset measurement and channel estimation during data transmission of frequency hopping data blocks. Since the UW word is a known sequence, after the UW word passes through the channel, according to the The sequence of the UW words affected by the channel and the original UW words can calculate the channel characteristics and complete the estimation of the channel. When the data length of the UW word is longer, the estimation of the channel is more accurate, so that the frequency hopping data block can have better anti-multipath ability, but the longer UW word means the effective data frame in the frequency hopping data block The smaller the proportion, the lower the efficiency of service data transmission, so the length of the UW word is determined according to the data rate of the service data.

Please refer to FIG. 2 , which lists the specific structure of frequency hopping data blocks in different data rate intervals and the specific design method of UW words in different data rate intervals in an embodiment of the present application. The UW word of business data in a high-speed interval The data length of the UW word is designed as three segments of UW words = 128+128+128, and the data length of the effective data frame is 1810; the data length of the UW word of the business data in the medium speed range is designed as three segments of UW words = 256+512 +512, the data length of the valid data frame is 912; the data length of the UW word of the service data in the high-speed interval is designed as three UW words=128+1024+128, and the data length of the valid data frame is 896.

Please refer to Figure 3 to summarize the processing rules of business data. When the data rate of business data is in the high-speed range, the transmission of business data is repeated by frequency hopping, that is, each hop in a hop group sends the same Intra-hop spread spectrum is not performed in the frequency hopping data block corresponding to each hop, the data length of the UW word is short, and the modulation method is QPSK to achieve anti-interference in the frequency domain; when the data rate of the business data is in the middle In the high-speed interval, the service data is sent by frequency hopping and repeated transmission. A small amount of intra-hop frequency spreading is performed in the frequency hopping data block corresponding to each hop. The data length of the UW word is moderate. The proportion is moderate, and the modulation method is BPSK, which realizes anti-interference in the frequency domain and code domain; when the data rate of the business data is in the low-speed range, the transmission of the business data is carried out in the way of frequency hopping and repeated transmission, and the corresponding hop of each hop In the frequency data block, a large amount of intra-hop spread spectrum is carried out. The data length of the UW word is longer, and it takes a larger proportion in the frequency hopping data block. The UW word makes the channel estimation accurate and improves the ability of anti-jamming, anti-noise and anti-multipath.

For the frequency hopping data block after finishing the spread spectrum processing and adding the UW word processing, the modulation method is selected according to the data rate of the service data, and the digital modulation method includes QPSK and BPSK. In an embodiment of the application, the data rate is at a high speed The business data in the interval adopts the QPSK modulation method; for the business data whose data rate is in the middle speed range and the low speed range, the DPSK modulation method is adopted. After the above steps, according to the data rate of the business data and the preset business data processing rules The frequency hopping data block is processed to generate a modulated signal.

S104: Send the modulated signal to the receiving end according to the frequency hopping code sequence;

Specifically, the modulated signal is sent, the transmission frequency of each frequency hopping data block is determined according to the frequency hopping code sequence, and the modulated signal is sent from the transmitting end to the receiving end through the channel according to the determined frequency hopping frequency.

Please refer to Figure 1. At the receiving end, the multi-rate anti-interference and anti-multipath method in UAV and satellite communication includes the following steps:

S201: Receive a modulated signal according to a frequency hopping code sequence;

Specifically, the frequency hopping code sequence acts on the receiving end at the same time, so that the receiving end can receive the modulated signal sent by the sending end according to the frequency hopping code sequence, and at the same time, the receiving end will perform the frequency hopping data block sent by each hop according to the UW word Synchronous calibration to complete the frequency hopping synchronization between the sending end and the receiving end.

S202: Remove the UW word included in the modulated signal, and generate a sequence to be equalized;

Specifically, the UW word in the received modulated signal is removed, and the remaining part of the modulated signal is used as the sequence to be equalized, and the sequence to be equalized is subjected to single-carrier frequency domain equalization processing, and the removed UW word is used for channel estimation, thereby Based on the result of the channel estimation, the channel characteristic of the channel through which the modulated signal is transmitted is obtained.

S203: Perform single-carrier frequency-domain equalization processing on the sequence to be equalized to obtain reconstructed data symbols;

Specifically, the basic idea of single-carrier frequency domain equalization technology is to estimate the frequency response of the channel, and then multiply each channel by an equalization coefficient to compensate the influence of the channel. The equalization coefficient is obtained according to the known training sequence, that is, this UW word in application.

In an embodiment of the present application, when performing single-carrier frequency domain equalization processing on the sequence to be equalized, an N-point FFT (Fast Fourier Transform) is performed on the sequence to be equalized, and the number of FFT points N is set to 2048 to complete the N-point After FFT, the sequence to be equalized is transformed into the frequency domain to obtain the frequency domain sequence Y(n).

According to the UW word, the channel characteristic H _K is obtained. Due to the existence of the UW word, the influence of the channel on a frequency hopping data block can be regarded as the circular convolution of the entire frequency hopping data block, and the multipath channel model can be rewritten as a circle Convolution, namely: y=H _K x+ω;

Where y is the UW word in the frequency hopping data block, x is the UW word affected by the channel, since both y and x are known sequences, the channel characteristic H _K can be obtained.

According to the channel characteristics H _K , the equalization coefficient W _K in the single-carrier frequency domain equalization process can be obtained. The equalization coefficient W _K can adopt the zero-forcing equalization criterion or the minimum average error criterion; if the zero-forcing equalization criterion is adopted, then :

If the minimum average error criterion is adopted, then:

Compensate the influence of the channel on the frequency domain sequence Y(n) according to the equalization coefficient W _K to obtain the equalized sequence X(n), where:

X(n)=W _K Y(n);

After the equalization process is completed, N-point IFFT (inverse fast Fourier transform) is performed on the equalized sequence X(n), and the equalized sequence X(n) is transformed back to the time domain, and the obtained time domain sequence is If the decision is made, the reconstructed data symbols can be obtained, and the single-carrier frequency domain equalization processing can be completed.

It should be noted that, in order to save resources and reduce the complexity of the program, the points of FFT and IFFT in the above steps are both 2048 points. When the actual data length N _b is less than the points N of FFT and IFFT, when performing FFT , add N _c zero values at the end of the sequence to be balanced, where:

N _c =NN _b ;

In this way, the data length of the sequence to be equalized is lengthened to 2048, so that the number of points of the FFT does not need to be changed according to the data length of the actual data; since N _c zero values are supplemented during the FFT, the time domain is obtained through the IFFT transformation sequence, only part of the data in the time-domain sequence is extracted, and in an embodiment of the present application, instead of extracting the first _Nb data in the time-domain sequence for judgment, a number of data are delayed in the time-domain sequence before making a judgment , the number of delayed data points depends on the number of data points preceding the main path.

The implementation principle of an anti-interference and anti-multipath method under multi-rate in the communication between UAV and satellite in the embodiment of the present application is as follows: at the sending end, the business data is repeatedly sent by frequency hopping, and the frequency hopping data in each hop Add UW words to the block and perform spread spectrum processing according to the spreading code sequence. The processing method of the frequency hopping data block is determined according to the data rate of the business data. The processed frequency hopping data block is sent to the receiving end according to the frequency hopping code sequence ; At the receiving end, receive service data according to the frequency hopping code sequence, perform single-carrier frequency domain equalization processing on the service data according to the UW word contained in the service data, and eliminate the influence of the channel on the service data. The present application can enable the service data to obtain better anti-interference and anti-multipath capabilities for service data with different data rates, and effectively improve the transmission quality of the service data.

The embodiment of the present application also discloses an anti-interference and anti-multipath system under multi-rate in communication between UAV and satellite.

Please refer to Figure 4, the multi-rate anti-jamming and anti-multipath system in UAV and satellite communication includes the following modules:

A data rate acquisition module 401, configured to acquire the data rate of service data;

A frequency hopping data block generating module 402, configured to generate a frequency hopping code sequence and load service data into the frequency hopping data block according to the frequency hopping code sequence;

Modulation signal generation module 403, for processing the frequency hopping data block according to the data rate of the service data and the preset service data processing rules, and generating the modulation signal;

The modulated signal sending module 404 is configured to send the modulated signal to the receiving end according to the frequency hopping code sequence, so that the receiving end processes the modulated signal after receiving the modulated signal according to the frequency hopping code sequence, and completes the transmission of service data.

Referring to FIG. 5 , it provides a schematic structural diagram of an electronic device 500 according to an embodiment of the present application. As shown in FIG. 5 , the electronic device 500 may include: at least one processor 501 , at least one network interface 504 , a user interface 503 , a memory 505 , and at least one communication bus 502 .

Wherein, the communication bus 502 is used to realize connection and communication between these components.

Wherein, the user interface 503 may include a display screen (Display) and a camera (Camera), and the optional user interface 503 may also include a standard wired interface and a wireless interface.

Wherein, the network interface 504 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface).

Wherein, the processor 501 may include one or more processing cores. The processor 501 uses various interfaces and lines to connect various parts of the entire server, and executes the server by running or executing instructions, programs, code sets or instruction sets stored in the memory 505, and calling data stored in the memory 505. Various functions and processing data. Optionally, the processor 501 may use at least one of Digital Signal Processing (Digital Signal Processing, DSP), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA), and Programmable Logic Array (Programmable LogicArray, PLA). implemented in the form of hardware. The processor 501 may integrate one or a combination of a central processing unit (Central Processing Unit, CPU), an image processor (Graphics Processing Unit, GPU), a modem, and the like. Among them, the CPU mainly handles the operating system, user interface and application programs, etc.; the GPU is used to render and draw the content that needs to be displayed on the display screen; the modem is used to handle wireless communication. It can be understood that the foregoing modem may not be integrated into the processor 501, but may be implemented by a single chip.

Wherein, the memory 505 may include a random access memory (Random Access Memory, RAM), or may include a read-only memory (Read-Only Memory). Optionally, the storage 505 includes a non-transitory computer-readable storage medium (non-transitory computer-readable storage medium). Memory 505 may be used to store instructions, programs, codes, sets of codes, or sets of instructions. The memory 505 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playback function, an image playback function, etc.), Instructions, etc. used to implement the above method embodiments; the storage data area can store data, etc. involved in the above method embodiments. Optionally, the memory 505 may also be at least one storage device located away from the aforementioned processor 501 . As shown in Figure 5, the memory 505 as a computer storage medium may include an operating system, a network communication module, a user interface module, and an application program for multi-rate anti-jamming and anti-multipath methods in UAV and satellite communication .

It should be noted that when the device provided by the above-mentioned embodiments realizes its functions, it only uses the division of the above-mentioned functional modules as an example. In practical applications, the above-mentioned function distribution can be completed by different functional modules according to needs. The internal structure of the system is divided into different functional modules to complete all or part of the functions described above. In addition, the device and method embodiments provided in the above embodiments belong to the same idea, and the specific implementation process thereof is detailed in the method embodiments, which will not be repeated here.

In the electronic device 500 shown in FIG. 5 , the user interface 503 is mainly used to provide the user with an input interface to obtain the data input by the user; The application program of the multi-rate anti-jamming and anti-multipath method in communication, when executed by one or more processors 501, enables the electronic device 500 to execute the method described in one or more of the above-mentioned embodiments.

A storage medium readable by the electronic device 500, the storage medium readable by the electronic device 500 stores instructions. When executed by one or more processors 501, the electronic device 500 is made to execute the method described in one or more of the foregoing embodiments.

Those skilled in the art can clearly understand that the technical solution of the present application can be realized by means of software and/or hardware. "Unit" and "module" in this specification refer to software and/or hardware that can complete specific functions independently or in cooperation with other components, where the hardware can be, for example, Field-Programmable Gate Array (Field-Programmable GateArray, FPGA), Integrated Circuit (Integrated Circuit, IC), etc.

It should be noted that for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the described action sequence. Depending on the application, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by this application.

In the foregoing embodiments, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or can be Integrate into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some service interfaces, and the indirect coupling or communication connection of devices or units may be in electrical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

If the integrated units are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable memory 505 . Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a memory 505 , including several instructions for enabling a computer device (which may be a personal computer, server or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned memory 505 includes: U disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), mobile hard disk, magnetic disk or optical disk and other media that can store program codes. .

Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above-mentioned embodiments can be completed by entering a program to instruct related hardware. The program can be stored in a computer-readable memory 505, and the memory 505 can include : flash disk, read-only memory (Read-Only Memory, ROM), random access device (Random Access Memory, RAM), magnetic disk or optical disk, etc.

What is described above is only an exemplary embodiment of the present disclosure, and should not limit the scope of the present disclosure. That is, all equivalent changes and modifications made according to the teachings of the present disclosure still fall within the scope of the present disclosure. Other embodiments of the disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any modification, use or adaptation of the present disclosure, and these modifications, uses or adaptations follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not described in the present disclosure , the specification and examples are to be considered as illustrative only.

Claims (10)

1. An anti-interference and anti-multipath method for multi-rate communication between an unmanned aerial vehicle and a satellite is characterized by comprising the following steps:

acquiring the data rate of service data;

generating a frequency hopping code sequence and filling the service data into a frequency hopping data block according to the frequency hopping code sequence;

processing the frequency hopping data block according to the data rate of the service data and a preset service data processing rule to generate a modulation signal;

and sending the modulation signal to a receiving end according to the frequency hopping code sequence, so that the receiving end processes the modulation signal after receiving the modulation signal according to the frequency hopping code sequence, and the transmission of the service data is completed.

2. The method for resisting interference and multipath at multiple rates in communication between an unmanned aerial vehicle and a satellite according to claim 1, wherein in processing the frequency-hopping data block according to the data rate of the service data and a preset service data processing rule, a modulation signal is generated, comprising the following steps:

generating a spread spectrum code sequence according to the data rate of the service data and a preset service data processing rule;

spreading the frequency hopping data block by the spreading code sequence;

selecting a modulation mode according to the data rate of the service data and a preset service data processing rule, wherein the modulation mode comprises QPSK or BPSK;

modulating the frequency hopping data block according to the selected modulation mode to generate a modulation signal.

3. The method for multi-rate anti-interference and multi-path resistance in unmanned aerial vehicle and satellite communication according to claim 2, further comprising the steps of, after spreading the valid data frames in the frequency-hopping data block according to the spreading code sequence: and adding a UW (universal word) into the frequency hopping data block according to the data rate of the service data and a preset service data processing rule, so that the receiving end carries out single-carrier frequency domain equalization processing on the modulation signal according to the UW.

4. The method for resisting interference and multipath at multiple rates in communication between a unmanned aerial vehicle and a satellite according to claim 3, wherein, when transmitting the modulated signal to a receiving end according to the hopping code sequence, the receiving end processes the modulated signal after receiving the modulated signal according to the hopping code sequence, and the method for transmitting the service data comprises the following steps:

receiving the modulated signal according to the hopping code sequence;

removing the UW word contained in the modulation signal to generate a sequence to be equalized;

carrying out single carrier frequency domain equalization processing on the sequence to be equalized to obtain a reconstructed data symbol, wherein each processing data block of the single carrier frequency domain equalization processing is one frequency hopping data block;

and despreading and demodulating the data symbols to finish the transmission of the service data.

5. The method for resisting interference and multipath at multiple rates in communication between an unmanned aerial vehicle and a satellite according to claim 4, wherein in the single carrier frequency domain equalization processing of the sequence to be equalized, the method specifically comprises the following steps:

performing N-point FFT on the sequence to be equalized to generate a frequency domain sequence Y (N);

obtaining channel characteristics according to the UW word;

obtaining an equalization coefficient W according to the channel characteristics _K ；

According to the equalizing coefficient W _K Performing equalization processing on the frequency domain sequence Y (n) to obtain an equalized sequence X (n), wherein: x (n) =w _K Y(n)；

Performing N-point IFFT on the sequence X (N) subjected to the equalization processing, and transforming the sequence X (N) subjected to the equalization processing into a time domain to obtain a time domain sequence;

and judging the time domain sequence to obtain the reconstructed data symbol, and finishing single carrier frequency domain equalization processing.

6. The method for resisting interference and multipath at multiple rates in communication between a unmanned aerial vehicle and a satellite according to claim 5, further comprising the steps of, before performing single carrier frequency domain equalization processing on the sequence to be equalized:

judging the data length N of the sequence to be equalized _b Whether it is smaller than the FFT length N;

if yes, supplementing N at the extreme end of the sequence to be equalized _c Zero values, wherein:

N _c ＝N-N _b ；

for completion N _c And carrying out the single carrier frequency domain equalization processing on the sequence to be equalized after the zero value supplementation.

7. The method for resisting interference and multipath at multiple rates in communication between a unmanned aerial vehicle and a satellite according to claim 5, wherein the method comprises the following steps: in the time domain sequenceColumn x _k And (n) when the judgment is carried out, a plurality of data points are delayed to carry out the judgment.

8. A multi-rate anti-interference and multi-path system for communication between a drone and a satellite based on any one of claims 1-7, said system comprising the following modules:

a data rate acquisition module (401) for acquiring a data rate of service data;

a frequency hopping data block generating module (402) for generating a frequency hopping code sequence and loading the service data into a frequency hopping data block according to the frequency hopping code sequence;

a modulation signal generating module (403) for processing the frequency-hopping data block according to the data rate of the service data and a preset service data processing rule to generate a modulation signal;

and the modulation signal sending module (404) is used for sending the modulation signal to a receiving end according to the frequency hopping code sequence, so that the receiving end processes the modulation signal after receiving the modulation signal according to the frequency hopping code sequence, and the transmission of the service data is completed.

9. A computer device, characterized by comprising a memory (505) and a processor (501), said memory having stored thereon a computer program capable of being loaded by the processor (501) and performing the method according to any one of claims 1 to 7.

10. A computer readable storage medium, characterized in that a computer program is stored which can be loaded by a processor (501) and which performs the method according to any one of claims 1 to 7.

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